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# This patches ActiveRecord so indexes created using the MySQL adapter ignore
# any PostgreSQL specific options (e.g. `using: :gin`).
#
# These patches do the following for MySQL:
#
# 1. Indexes created using the :opclasses option are ignored (as they serve no
# purpose on MySQL).
# 2. When creating an index with `using: :gin` the `using` option is discarded
# as :gin is not a valid value for MySQL.
# 3. The `:opclasses` option is stripped from add_index_options in case it's
# used anywhere other than in the add_index methods.
if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
module ActiveRecord
module ConnectionAdapters
class Mysql2Adapter < AbstractMysqlAdapter
alias_method :__gitlab_add_index, :add_index
alias_method :__gitlab_add_index_sql, :add_index_sql
alias_method :__gitlab_add_index_options, :add_index_options
def add_index(table_name, column_name, options = {})
unless options[:opclasses]
__gitlab_add_index(table_name, column_name, options)
end
end
def add_index_sql(table_name, column_name, options = {})
unless options[:opclasses]
__gitlab_add_index_sql(table_name, column_name, options)
end
end
def add_index_options(table_name, column_name, options = {})
if options[:using] && options[:using] == :gin
options = options.dup
options.delete(:using)
end
if options[:opclasses]
options = options.dup
options.delete(:opclasses)
end
__gitlab_add_index_options(table_name, column_name, options)
end
end
end
end
end
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